The National Plant Diagnostic Network (NPDN) has developed an educational program for crop consultants, county extension educators, and for those who monitor the health of crops. These programs provide training for "First Detectors" - people who are trained to have a heightened awareness to the potential for exotic pests or diseases. Their training sessions and online training modules provide a good resource for people interested in acting as First Detectors. You can find more information about the program at the Purdue Plant and Pest Diagnostic Laboratory or can jump directly to the NPDN Training Site for First Detectors.